Bottom Line:
Based on these results Cyphacolus syn. n. is placed as a junior synonym of Odontacolus which is here redefined.Odontacolus markadicus, previously only known from India, is here recorded from Brunei, Malaysia, Sri Lanka, Thailand and Vietnam.The relationships, distribution and biology of Odontacolus are discussed, and a key is provided to identify all species.

Mentions:
The previously described species Odontacolus longispinosus Girault (Fig. 1) and Odontacolus amoenus Kononova are here transferred to the genus Idris Försterand should therefore be treated as new combinations. We were unable to borrow the holotype of Odontacolus amoenus but one of us (NFJ) during a recent visit to the UASK was able to examine a female paratype and confirm that the species does indeed belong to Idris.

Mentions:
The previously described species Odontacolus longispinosus Girault (Fig. 1) and Odontacolus amoenus Kononova are here transferred to the genus Idris Försterand should therefore be treated as new combinations. We were unable to borrow the holotype of Odontacolus amoenus but one of us (NFJ) during a recent visit to the UASK was able to examine a female paratype and confirm that the species does indeed belong to Idris.

Bottom Line:
Based on these results Cyphacolus syn. n. is placed as a junior synonym of Odontacolus which is here redefined.Odontacolus markadicus, previously only known from India, is here recorded from Brunei, Malaysia, Sri Lanka, Thailand and Vietnam.The relationships, distribution and biology of Odontacolus are discussed, and a key is provided to identify all species.